Search found 77 matches

by LeAirraBullingor2k
Fri Feb 21, 2020 7:38 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Finding Gibbs free energy with K
Replies: 3
Views: 33

Finding Gibbs free energy with K

On the homework problem 5g.13, how do we calculate gibbs free energy if we arent given the value of RT?
by LeAirraBullingor2k
Mon Feb 10, 2020 11:47 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Ideal gas heat capacity
Replies: 1
Views: 17

Ideal gas heat capacity

What does it mean when it says the heat capacity of the ideal gas is independent of temperature?
by LeAirraBullingor2k
Mon Feb 10, 2020 8:49 pm
Forum: Calculating Work of Expansion
Topic: calculating work of a reversible reaction
Replies: 5
Views: 34

calculating work of a reversible reaction

When will work be negative? Like how will we know whether to keep the negative number or not?
by LeAirraBullingor2k
Fri Feb 07, 2020 1:06 am
Forum: Phase Changes & Related Calculations
Topic: HW problems 4B.3
Replies: 2
Views: 24

HW problems 4B.3

Is the answer to part B of this question wrong in the answer key? I'm getting 490 J and I don't see how 90x10^2 would be the answer.
by LeAirraBullingor2k
Sun Feb 02, 2020 8:53 pm
Forum: Student Social/Study Group
Topic: Midterm study
Replies: 8
Views: 80

Re: Midterm study

Not only should you attend the review sessions but also work out as many homework problems as you can! Sometimes test questions will be based on homework problems and it'll help you grasp the concepts.
by LeAirraBullingor2k
Sun Feb 02, 2020 8:49 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess’ Law
Replies: 10
Views: 53

Re: Hess’ Law

Hess's law allows us to calculate the total enthalpy change in a reaction regardless of what steps had to be taken to get to a certain chemical equation.
by LeAirraBullingor2k
Sun Feb 02, 2020 8:41 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: PLF sessions
Replies: 6
Views: 61

PLF sessions

Is it possible to attend a PLF session you are not enrolled in? I have one but cannot make the other day that my PLF has set up.
by LeAirraBullingor2k
Sun Feb 02, 2020 8:39 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 4
Views: 22

Hess's Law

What is the quickest way to go about solving these types of problems?
by LeAirraBullingor2k
Sun Feb 02, 2020 8:33 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Calculating heat of open and closed systems
Replies: 1
Views: 39

Calculating heat of open and closed systems

How do we calculate the heat of a closed system vs an open system?
by LeAirraBullingor2k
Fri Jan 24, 2020 12:35 am
Forum: Ideal Gases
Topic: Homework 3
Replies: 6
Views: 80

Homework 3

Is it okay to do homework problems from Acids and Bases for homework 3?
by LeAirraBullingor2k
Thu Jan 23, 2020 10:44 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Molar concentration of H3O
Replies: 6
Views: 25

Molar concentration of H3O

How do we calculate the molar concentration of H3O given just the Kw?
by LeAirraBullingor2k
Thu Jan 23, 2020 9:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium concentration help
Replies: 4
Views: 24

Equilibrium concentration help

Since solids are not used to calculate K, when using ICE tables do we just put a 0 for initial concentration?
by LeAirraBullingor2k
Thu Jan 23, 2020 5:59 pm
Forum: Ideal Gases
Topic: Homework problem 5I.11
Replies: 3
Views: 37

Homework problem 5I.11

Can anyone help me to understand how they got 6.9 as the answer to the first part of the question?
by LeAirraBullingor2k
Sun Jan 19, 2020 11:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: identifying acids & bases
Replies: 5
Views: 31

Re: identifying acids & bases

Acids will be the ones donating hydrogen ions and bases will be accepting them
by LeAirraBullingor2k
Sun Jan 19, 2020 11:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: determining which way the reaction is going
Replies: 5
Views: 23

determining which way the reaction is going

What are the steps to determining which way the reaction is going? Isn't it just product over reactants and for gases it just P over RT?
by LeAirraBullingor2k
Sun Jan 19, 2020 9:52 pm
Forum: Ideal Gases
Topic: Topics on Test 1
Replies: 37
Views: 241

Re: Topics on Test 1

It will be Chemical Equilibrium and Acids and Bases
by LeAirraBullingor2k
Sun Jan 19, 2020 9:48 pm
Forum: Ideal Gases
Topic: ICE Tables
Replies: 8
Views: 50

ICE Tables

I need some help figuring out how to complete ice tables. How do we know to use -X or X?
by LeAirraBullingor2k
Sun Jan 19, 2020 8:47 pm
Forum: Ideal Gases
Topic: homework #3
Replies: 16
Views: 136

Re: homework #3

Since we just finished Acids and Bases I think you should still be able to use it but you should probably do a couple from the new section.
by LeAirraBullingor2k
Sun Jan 12, 2020 8:15 pm
Forum: Ideal Gases
Topic: Ideal gases equation
Replies: 3
Views: 24

Re: Ideal gases equation

Thank you !
by LeAirraBullingor2k
Sun Jan 12, 2020 8:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hw for next week
Replies: 19
Views: 107

Hw for next week

Is it okay to do a few problems from equilibrium constants for next weeks homework?
by LeAirraBullingor2k
Sun Jan 12, 2020 8:08 pm
Forum: Ideal Gases
Topic: Ideal gases equation
Replies: 3
Views: 24

Ideal gases equation

What does the n stand for in nRT?
by LeAirraBullingor2k
Sun Jan 12, 2020 8:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Studying tips
Replies: 10
Views: 46

Studying tips

Can anyone offer any studying tips for test 1 that has work for 14A?
by LeAirraBullingor2k
Sun Jan 12, 2020 7:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp
Replies: 6
Views: 36

Kp

Is Kp only used when dealing with gases?
by LeAirraBullingor2k
Sun Jan 12, 2020 7:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: memorization
Replies: 12
Views: 62

Re: memorization

We aren't expected to memorize K values, I'm sure they will be given.
by LeAirraBullingor2k
Sun Dec 08, 2019 12:23 am
Forum: Administrative Questions and Class Announcements
Topic: Final tips
Replies: 19
Views: 174

Re: Final tips

Do homework problems, make flashcards for the common ligand names, and try to do UA session worksheets
by LeAirraBullingor2k
Sun Dec 08, 2019 12:21 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6B.5 help
Replies: 1
Views: 28

6B.5 help

In part e, 13.6 mg of NaOH is dissolved in .350 L and we have to find the ph and pOH. Can anyone explain their process on this problem?
by LeAirraBullingor2k
Thu Dec 05, 2019 12:24 pm
Forum: Naming
Topic: Homework week 9
Replies: 1
Views: 19

Homework week 9

Can we use 9C problems for our week 9 homework? I can't remember if we were still doing naming that week.
by LeAirraBullingor2k
Wed Dec 04, 2019 10:23 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid or Base
Replies: 2
Views: 40

Acid or Base

Why is SO3 an acid when the structure is nonpolar?
by LeAirraBullingor2k
Wed Dec 04, 2019 9:44 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Oxoacids
Replies: 2
Views: 33

Oxoacids

What makes a molecule an oxoacid?
by LeAirraBullingor2k
Sun Dec 01, 2019 9:02 pm
Forum: Bond Lengths & Energies
Topic: Hydrogen Bonding
Replies: 9
Views: 100

Re: Hydrogen Bonding

Hydrogen bonding occurs between Hydrogens that are connected to Nitrogen, Oxygen, and Fluorine
by LeAirraBullingor2k
Sun Dec 01, 2019 8:02 pm
Forum: Conjugate Acids & Bases
Topic: Naming
Replies: 4
Views: 58

Naming

Has anyone found an easy way to remember how to name molecules?
by LeAirraBullingor2k
Fri Nov 29, 2019 11:26 pm
Forum: Resonance Structures
Topic: Molecules with resonance
Replies: 4
Views: 73

Molecules with resonance

In lecture, did Lavelle say that acids are stronger or weaker when they have resonance?
by LeAirraBullingor2k
Fri Nov 29, 2019 7:44 pm
Forum: Bronsted Acids & Bases
Topic: Strong acids and bases
Replies: 2
Views: 23

Strong acids and bases

Would it be enough for us to know the common strong/weak acids and bases for the final?
by LeAirraBullingor2k
Fri Nov 29, 2019 6:21 pm
Forum: Bronsted Acids & Bases
Topic: Acids and Bases
Replies: 3
Views: 29

Acids and Bases

When determining whether a molecule will be an acid or a base in water, do we draw the structure out to help us figure it out? Or do we just have to be familiar with common acids and bases to know the answer?
by LeAirraBullingor2k
Sun Nov 24, 2019 11:55 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent character
Replies: 4
Views: 53

Re: Ionic and Covalent character

So im assuming that if he did, it would be obvious ones that wouldn't require the chart to figure out.
by LeAirraBullingor2k
Sun Nov 24, 2019 11:48 pm
Forum: Lewis Structures
Topic: lone pairs
Replies: 7
Views: 112

Re: lone pairs

Make sure to check the valence electrons and remember that the atom that is more electronegative will hold more electrons.
by LeAirraBullingor2k
Sun Nov 24, 2019 11:40 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent character
Replies: 4
Views: 53

Ionic and Covalent character

Do you think we'll be tested on this since our formula sheet doesn't include an electronegativity chart?
by LeAirraBullingor2k
Sun Nov 24, 2019 11:37 pm
Forum: Naming
Topic: Week 9 and Week 10 HW?
Replies: 21
Views: 167

Re: Week 9 and Week 10 HW?

That should be fine!
by LeAirraBullingor2k
Sun Nov 24, 2019 11:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Practice
Replies: 3
Views: 82

Final Practice

Has anyone found a practice final exam with answers they could share?
by LeAirraBullingor2k
Sun Nov 24, 2019 11:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 2
Views: 33

Test 2

Does anyone know when we get our grades back for this test? Also, did he mention when he was going to stop going over new content before the final? Friday seems a little too late to learn new stuff before the Sunday final.
by LeAirraBullingor2k
Sun Nov 24, 2019 11:29 pm
Forum: DeBroglie Equation
Topic: Studying Methods
Replies: 1
Views: 46

Studying Methods

Does anyone have any worksheets on this topic or any topic in quantum that I can use to review?
by LeAirraBullingor2k
Sun Nov 17, 2019 8:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs non polar
Replies: 5
Views: 35

Polar vs non polar

Is it safe to assume that all molecules with lone pairs will be polar?
by LeAirraBullingor2k
Sat Nov 16, 2019 11:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Tool to Memorize VSEPR
Replies: 3
Views: 40

Re: Tool to Memorize VSEPR

Thank you so much for this! I'm definitely going to use this method.
by LeAirraBullingor2k
Sat Nov 16, 2019 11:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Pentagonal Bipyramidal
Replies: 8
Views: 78

Re: Pentagonal Bipyramidal

I'm sure this will be included in the test since that entire section (2E) is on the syllabus.
by LeAirraBullingor2k
Fri Nov 15, 2019 1:12 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs Nonpolar molecules
Replies: 4
Views: 31

Polar vs Nonpolar molecules

Hello, an example in the book explains that a molecule is nonpolar because "the symmetry allows all three dipoles to cancel" but I'm not seeing how this symmetry concept applies to other molecules. Can anyone provide another way to tell if a molecule is nonpolar?
by LeAirraBullingor2k
Tue Nov 12, 2019 7:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining electron arrangements
Replies: 1
Views: 22

Re: Determining electron arrangements

Nevermind, I just realized it because of the two lone pairs!
by LeAirraBullingor2k
Tue Nov 12, 2019 7:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining electron arrangements
Replies: 1
Views: 22

Determining electron arrangements

In 2E.3B in the book it asks for the shape and electron arrangement for ClO2-. I understand that the shape is angular but how is the electron arrangement tetrahedral when there are only 3 elements in this molecule.
by LeAirraBullingor2k
Mon Nov 11, 2019 4:16 pm
Forum: Administrative Questions and Class Announcements
Topic: 14BL
Replies: 5
Views: 72

Re: 14BL

My counselor recommended that I take Chem 14B and 14BL afterwards so that I won't be confused with the content from the lab. Basically, 14B will prepare you for the lab.
by LeAirraBullingor2k
Mon Nov 11, 2019 4:12 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 8
Views: 64

Re: Bond Strength

Ionic bonds are stronger than covalent bonds because in covalent bonds, the electrons are shared so it has a lower electronegativity. Highly charged ions will have stronger bonds than ions with small charges.
by LeAirraBullingor2k
Mon Nov 11, 2019 4:05 pm
Forum: Trends in The Periodic Table
Topic: Ionization energy
Replies: 6
Views: 83

Ionization energy

Why does Oxygen have a lower ionization energy than Nitrogen?
by LeAirraBullingor2k
Tue Nov 05, 2019 8:53 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum numbers
Replies: 1
Views: 30

Quantum numbers

How would you find the first two quantum numbers of the last electron in an element?
by LeAirraBullingor2k
Tue Nov 05, 2019 8:20 pm
Forum: Lewis Structures
Topic: Lewis structure for Nitrate
Replies: 4
Views: 54

Lewis structure for Nitrate

I was wondering if the most stable Lewis structure for NO2- would be the one with the negative charge on Nitrogen or a negative charge on Oxygen?
by LeAirraBullingor2k
Sun Nov 03, 2019 11:07 pm
Forum: Ionic & Covalent Bonds
Topic: Strength and Length
Replies: 18
Views: 143

Re: Strength and Length

As the length of a bond decreases, the strength of the bond increases.
by LeAirraBullingor2k
Sun Nov 03, 2019 10:39 pm
Forum: Lewis Structures
Topic: Showing work for valence electrons
Replies: 3
Views: 28

Re: Showing work for valence electrons

Yes my TA recommended that we show important work so that if we make a mistake along the way, he'd be able to see if the wrong answer came from us simply not knowing the correct steps or if we just made a mistake but were headd in the right direction.
by LeAirraBullingor2k
Sun Nov 03, 2019 9:54 pm
Forum: Lewis Structures
Topic: "Most favorable" Diagram
Replies: 4
Views: 34

Re: "Most favorable" Diagram

The most favorable lewis structures will be the ones with the least formal charge or formal charges that add up to zero. I'm not sure if we would be asked to draw all of them but you can draw a resonance hybrid to show the different arrangements of electrons.
by LeAirraBullingor2k
Mon Oct 28, 2019 9:37 pm
Forum: Trends in The Periodic Table
Topic: Ionic Radius
Replies: 5
Views: 66

Re: Ionic Radius

All three of those atoms essentially copy the orientation of Argon as they have gained electrons in order to satisfy the octet rule. However, since they have gained electrons but keep the same number of protons, the positive charge is spread out more over the atom with each additional negative char...
by LeAirraBullingor2k
Mon Oct 28, 2019 9:12 pm
Forum: Trends in The Periodic Table
Topic: Ionic Radius
Replies: 5
Views: 66

Ionic Radius

Hello, I understand that the trend of ionic radius increases as you move to the left and down a column but I'm not understanding how to order ions with different charges. For example, S 2- , Cl - , P 3- . If they were neutrally charged, it would be Cl, S, and P in order of increasing ionic radius bu...
by LeAirraBullingor2k
Sun Oct 27, 2019 8:44 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge in Ions
Replies: 3
Views: 52

Re: Formal Charge in Ions

They cannot have a formal charge of zero because they are no longer neutral when gaining or losing electrons.
by LeAirraBullingor2k
Sun Oct 27, 2019 4:45 pm
Forum: Resonance Structures
Topic: Bond lenghts.
Replies: 11
Views: 78

Re: Bond lenghts.

I don't think we have to know how to calculate bond lengths since this was never mentioned. It just seems like he just wants us to know that double bonds are shorter than single ones.
by LeAirraBullingor2k
Wed Oct 23, 2019 6:54 pm
Forum: Ionic & Covalent Bonds
Topic: What topic are we on?
Replies: 11
Views: 129

Re: What topic are we on?

My TA confirmed that we can do homework problems from both sections this week.
by LeAirraBullingor2k
Wed Oct 23, 2019 6:45 pm
Forum: Lewis Structures
Topic: Formal charge in Lewis structures
Replies: 1
Views: 28

Formal charge in Lewis structures

In bonds like SF5-, why would it be better to have the remaining two electrons on S rather than creating a double bond between one of the Fluorines? Either way, you aren't really getting the formal charge so I'm a little confused.
by LeAirraBullingor2k
Mon Oct 21, 2019 11:31 am
Forum: SI Units, Unit Conversions
Topic: Additional Practice
Replies: 2
Views: 67

Additional Practice

Can anyone recommend an additional online practice that has worked for you? Sometimes I cannot make it to the step-up programs so I would like something I can do myself. For example, websites like Khan Academy.
by LeAirraBullingor2k
Mon Oct 21, 2019 11:28 am
Forum: Significant Figures
Topic: Sig Figs on Tests
Replies: 24
Views: 375

Re: Sig Figs on Tests

To figure out how many significant figures you should use, look for the number in the problem with the least amount of significant figures.
by LeAirraBullingor2k
Mon Oct 21, 2019 11:25 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: how to prepare
Replies: 22
Views: 176

Re: how to prepare

Definitely attend the step up sessions and apply to get a PLF in Campbell Hall to get extra help during the week.
by LeAirraBullingor2k
Thu Oct 17, 2019 5:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Subshell #
Replies: 1
Views: 31

Subshell #

Would a 6-d subshell be the same as having a principal quantum number of 6?
by LeAirraBullingor2k
Thu Oct 17, 2019 11:06 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 58
Views: 825

Advice for studying

Can anyone give me tips on studying and preparing for the week? I'm still trying to figure the best routine to learn and review the different topics each week. Thank you in advance.
by LeAirraBullingor2k
Thu Oct 17, 2019 11:02 am
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 158
Views: 88026

Re: Advice from a Medical Student [ENDORSED]

Thank you so much for your advice! Would you recommend taking 14B and 14BL at the same time? or should I save my labs for the summer?
by LeAirraBullingor2k
Sun Oct 13, 2019 9:55 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 118
Views: 21412

Re: Final Jitters

What eases my anxiety is going through practice problems multiple times to ensure that I fully understand each step and concept. It also helps to take 10-minute study breaks in between to make sure you are not overwhelming yourself with tons of information from the quarter. Finally, a good thing to ...
by LeAirraBullingor2k
Sun Oct 13, 2019 9:11 pm
Forum: Properties of Electrons
Topic: Change in electron energy
Replies: 2
Views: 23

Re: Change in electron energy

Thank you so much!
by LeAirraBullingor2k
Sun Oct 13, 2019 9:06 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 3285

Re: Test 1 [ENDORSED]

I don't know if someone has asked this already but would we get partial credit for unfinished problems headed in the right direction?
by LeAirraBullingor2k
Sun Oct 13, 2019 8:56 pm
Forum: Properties of Electrons
Topic: Change in electron energy
Replies: 2
Views: 23

Change in electron energy

Why is it that when the energy of an electron changes to a lower energy, the difference in energy is given off as a photon?
by LeAirraBullingor2k
Wed Oct 09, 2019 7:38 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 169
Views: 105085

Re: Rusty on High School Chem [ENDORSED]

Same with me, I haven't taken chemistry since the 10th grade and I'm a sophomore. What has been helping me a lot is doing every homework problem and also enrolling in AAP peer learning. These peer learning facilitators really know what they're doing and have helped me in other series too!
by LeAirraBullingor2k
Thu Oct 03, 2019 11:06 pm
Forum: Balancing Chemical Reactions
Topic: Writing out equations
Replies: 9
Views: 158

Re: Writing out equations

In which cases would it be based on charge and when would it just be based on the order?
by LeAirraBullingor2k
Thu Oct 03, 2019 10:53 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant problems
Replies: 4
Views: 44

Limiting Reactant problems

During lecture, Dr.Lavelle mentioned side reactions and how they will change the yield, will the lost product amount be given or is this just something. we estimate?
by LeAirraBullingor2k
Thu Oct 03, 2019 10:37 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Aqueous, solid, gas
Replies: 11
Views: 159

Aqueous, solid, gas

How do you figure out if bonded elements are aqueous, solid or gas? People seem to know very quickly so I'm wondering if there's an easy way to know.
by LeAirraBullingor2k
Thu Oct 03, 2019 10:35 pm
Forum: SI Units, Unit Conversions
Topic: Question about Showing Work
Replies: 22
Views: 277

Re: Question about Showing Work

I think it would be in your best interest to show work. I believe the TA's won't take off points since the homework problems are a point each but it'll help you remember more.
by LeAirraBullingor2k
Thu Oct 03, 2019 10:32 pm
Forum: Balancing Chemical Reactions
Topic: Writing out equations
Replies: 9
Views: 158

Writing out equations

On questions like problem H3 on the homework this week, I was wondering if there was a specific order we should write our equations in? For example, would it matter if it was SiH4 or H4Si. It's been a minute since I've taken a chemistry class so I cant remember.

Go to advanced search